Water-Soluble Acrylamide Copolymers.IX.Preparation and Characterization of hte Cationic Derivatives of Poly(acrylamide-co-N,N-dimethylacrylamide),Poly(acrylamie-co-methacrylamide),and Poly(acrylamide-co-N-t-butylacrylamide)

摘要

This, article extends the preparative details of a series of nonionic copoly-mers of acrylamide with N,N-dimethylacrylamide, methacrylamide, and N-t-butylac-rylamide to the synthesis of cationic derivatives of these new copolymers. The described procedures gave products with cationicities of 14-26 mol %. We measured the mean squared radii of gyration and intrinsic viscosities of aqueous solutions of these products at several different pHs and NaCI concentrations to compare these values with those determined for the nonionic precursors and related commercial cationic polymers. Because the molecular weights of the examples measured varied widely, it was difficult to establish definite trends. However, the large values obtained for the mean squared radii of gyration and intrinsic viscosities, relative to the nonionic precursors of these polymers, demonstrated that the charged groups had a qualitatively greater effect on polymer extension than the nonpolar bulky groups.